Migrate back to std:: stylistically (#554)

* Migrate back to `std::` stylistically

This commit moves away from idioms such as `alloc::` and `core::` as
imports of standard data structures and types. Instead it migrates all
crates to uniformly use `std::` for importing standard data structures
and types. This also removes the `std` and `core` features from all
crates to and removes any conditional checking for `feature = "std"`

All of this support was previously added in #407 in an effort to make
wasmtime/cranelift "`no_std` compatible". Unfortunately though this
change comes at a cost:

* The usage of `alloc` and `core` isn't idiomatic. Especially trying to
  dual between types like `HashMap` from `std` as well as from
  `hashbrown` causes imports to be surprising in some cases.
* Unfortunately there was no CI check that crates were `no_std`, so none
  of them actually were. Many crates still imported from `std` or
  depended on crates that used `std`.

It's important to note, however, that **this does not mean that wasmtime
will not run in embedded environments**. The style of the code today and
idioms aren't ready in Rust to support this degree of multiplexing and
makes it somewhat difficult to keep up with the style of `wasmtime`.
Instead it's intended that embedded runtime support will be added as
necessary. Currently only `std` is necessary to build `wasmtime`, and
platforms that natively need to execute `wasmtime` will need to use a
Rust target that supports `std`. Note though that not all of `std` needs
to be supported, but instead much of it could be configured off to
return errors, and `wasmtime` would be configured to gracefully handle
errors.

The goal of this PR is to move `wasmtime` back to idiomatic usage of
features/`std`/imports/etc and help development in the short-term.
Long-term when platform concerns arise (if any) they can be addressed by
moving back to `no_std` crates (but fixing the issues mentioned above)
or ensuring that the target in Rust has `std` available.

* Start filling out platform support doc

crates/api/src/trampoline/create_handle.rs

@@ -1,16 +1,13 @@
 //! Support for a calling of an imported function.
 
 use crate::runtime::Store;
-use crate::{HashMap, HashSet};
-use alloc::boxed::Box;
-use alloc::rc::Rc;
-use alloc::string::String;
-use alloc::vec::Vec;
 use anyhow::Result;
-use core::any::Any;
-use core::cell::{RefCell, RefMut};
 use cranelift_entity::PrimaryMap;
 use cranelift_wasm::DefinedFuncIndex;
+use std::any::Any;
+use std::cell::{RefCell, RefMut};
+use std::collections::{HashMap, HashSet};
+use std::rc::Rc;
 use wasmtime_environ::Module;
 use wasmtime_runtime::{Imports, InstanceHandle, VMFunctionBody};
 

crates/api/src/trampoline/func.rs

@@ -3,15 +3,15 @@
 use super::create_handle::create_handle;
 use crate::r#ref::HostRef;
 use crate::{Callable, FuncType, Store, Trap, Val};
-use alloc::{boxed::Box, rc::Rc, string::ToString, vec::Vec};
 use anyhow::Result;
-use core::cmp;
 use cranelift_codegen::ir::{types, InstBuilder, StackSlotData, StackSlotKind, TrapCode};
 use cranelift_codegen::print_errors::pretty_error;
 use cranelift_codegen::{binemit, ir, isa, Context};
 use cranelift_entity::{EntityRef, PrimaryMap};
 use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
 use cranelift_wasm::{DefinedFuncIndex, FuncIndex};
+use std::cmp;
+use std::rc::Rc;
 use wasmtime_environ::{CompiledFunction, Export, Module};
 use wasmtime_jit::CodeMemory;
 use wasmtime_runtime::{InstanceHandle, VMContext, VMFunctionBody};

crates/api/src/trampoline/global.rs

@@ -1,6 +1,5 @@
 use super::create_handle::create_handle;
 use crate::{GlobalType, Mutability, Val};
-use alloc::boxed::Box;
 use anyhow::Result;
 use cranelift_entity::PrimaryMap;
 use wasmtime_environ::Module;

crates/api/src/trampoline/memory.rs

@@ -1,7 +1,5 @@
 use super::create_handle::create_handle;
 use crate::MemoryType;
-use alloc::boxed::Box;
-use alloc::string::ToString;
 use anyhow::Result;
 use cranelift_entity::PrimaryMap;
 use wasmtime_environ::Module;
@@ -14,7 +12,7 @@ pub fn create_handle_with_memory(memory: &MemoryType) -> Result<InstanceHandle>
 
     let memory = cranelift_wasm::Memory {
         minimum: memory.limits().min(),
-        maximum: if memory.limits().max() == core::u32::MAX {
+        maximum: if memory.limits().max() == std::u32::MAX {
             None
         } else {
             Some(memory.limits().max())

crates/api/src/trampoline/mod.rs

@@ -12,8 +12,8 @@ use self::memory::create_handle_with_memory;
 use self::table::create_handle_with_table;
 use super::{Callable, FuncType, GlobalType, MemoryType, Store, TableType, Val};
 use crate::r#ref::HostRef;
-use alloc::rc::Rc;
 use anyhow::Result;
+use std::rc::Rc;
 
 pub use self::global::GlobalState;
 

crates/api/src/trampoline/table.rs

@@ -1,7 +1,5 @@
 use super::create_handle::create_handle;
 use crate::{TableType, ValType};
-use alloc::boxed::Box;
-use alloc::string::ToString;
 use anyhow::Result;
 use cranelift_entity::PrimaryMap;
 use cranelift_wasm::TableElementType;
@@ -13,7 +11,7 @@ pub fn create_handle_with_table(table: &TableType) -> Result<InstanceHandle> {
 
     let table = cranelift_wasm::Table {
         minimum: table.limits().min(),
-        maximum: if table.limits().max() == core::u32::MAX {
+        maximum: if table.limits().max() == std::u32::MAX {
             None
         } else {
             Some(table.limits().max())