make wiggle-generate ordinary lib, and wiggle the proc-macro lib

this allows us to reuse the code in wiggle-generate elsewhere, because
a proc-macro=true lib can only export a #[proc_macro] and not ordinary
functions.

In lucet, I will depend on wiggle-generate to define a proc macro that
glues wiggle to the specifics of the runtime.

tests/arrays.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestArray, GuestError, GuestPtr, GuestPtrMut, GuestType};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/arrays.witx"],
     ctx: WasiCtx,
 });

tests/atoms.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestError, GuestRef};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/atoms.witx"],
     ctx: WasiCtx,
 });

tests/flags.rs

@@ -3,7 +3,7 @@ use std::convert::TryFrom;
 use wiggle_runtime::{GuestError, GuestPtr};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/flags.witx"],
     ctx: WasiCtx,
 });

tests/handles.rs

@@ -4,7 +4,7 @@ use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
 const FD_VAL: u32 = 123;
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/handles.witx"],
     ctx: WasiCtx,
 });

tests/ints.rs

@@ -3,7 +3,7 @@ use std::convert::TryFrom;
 use wiggle_runtime::GuestError;
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/ints.witx"],
     ctx: WasiCtx,
 });

tests/pointers.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestError, GuestPtr, GuestPtrMut, GuestRefMut, GuestType};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/pointers.witx"],
     ctx: WasiCtx,
 });

tests/strings.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestError, GuestPtrMut, GuestString};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/strings.witx"],
     ctx: WasiCtx,
 });

tests/structs.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestError, GuestPtr};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/structs.witx"],
     ctx: WasiCtx,
 });

tests/union.rs

@@ -2,7 +2,7 @@ use proptest::prelude::*;
 use wiggle_runtime::{GuestError, GuestType};
 use wiggle_test::{impl_errno, HostMemory, MemArea, WasiCtx};
 
-wiggle_generate::from_witx!({
+wiggle::from_witx!({
     witx: ["tests/union.witx"],
     ctx: WasiCtx,
 });