Begin internal reorganization.

This begins reorganizing how translation and compilation occur, and
setting up infrastructure for imports/exports and relocations. It
splits parts out of StandaloneRuntime, forming Module, Compilation,
and Instance structs, which can be used more independently.

It also simplifies the command-line interface, in a step towards
making simple tools that just expose the functionality of the
libraries.

Cargo.toml

@@ -25,14 +25,9 @@ cretonne-native = { git = "https://github.com/stoklund/cretonne.git" }
 wasmstandalone_runtime = { path = "lib/runtime" }
 wasmstandalone_execute = { path = "lib/execute" }
 wasmstandalone_obj = { path = "lib/obj" }
-wasmparser = "0.11.2"
-wasmtext = { git = "https://github.com/yurydelendik/wasmtext" }
-filecheck = "0.0.1"
 docopt = "0.8.0"
 serde = "1.0.8"
 serde_derive = "1.0.8"
-num_cpus = "1.5.1"
-term = "0.4.6"
 tempdir = "*"
 faerie = { git = "https://github.com/m4b/faerie" }