Implement color output for wasm builder (#4004)

* Implement color output for wasm builder

* Fix `Cargo.lock`

substrate/core/utils/wasm-builder/README.md

@@ -1,9 +1,9 @@
-## WASM builder is a utility for building a project as a WASM binary
+# WASM builder is a utility for building a project as a WASM binary
 
 The WASM builder is a tool that integrates the process of building the WASM binary of your project into the main
 `cargo` build process.
 
-### Project setup
+## Project setup
 
 A project that should be compiled as a WASM binary needs to:
 
@@ -34,25 +34,28 @@ include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
 This will include the generated WASM binary as two constants `WASM_BINARY` and `WASM_BINARY_BLOATY`.
 The former is a compact WASM binary and the latter is not compacted.
 
-### Environment variables
+## Environment variables
 
 By using environment variables, you can configure which WASM binaries are built and how:
 
-- `SKIP_WASM_BUILD` - Skips building any WASM binary. This is useful when only native should be recompiled.
-- `BUILD_DUMMY_WASM_BINARY` - Builds dummy WASM binaries. These dummy binaries are empty and useful
+- `SKIP_WASM_BUILD` - Skips building any wasm binary. This is useful when only native should be recompiled.
+- `BUILD_DUMMY_WASM_BINARY` - Builds dummy wasm binaries. These dummy binaries are empty and useful
                              for `cargo check` runs.
-- `WASM_BUILD_TYPE` - Sets the build type for building WASM binaries. Supported values are `release` or `debug`.
+- `WASM_BUILD_TYPE` - Sets the build type for building wasm binaries. Supported values are `release` or `debug`.
                       By default the build type is equal to the build type used by the main build.
-- `TRIGGER_WASM_BUILD` - Can be set to trigger a WASM build. On subsequent calls the value of the variable
+- `TRIGGER_WASM_BUILD` - Can be set to trigger a wasm build. On subsequent calls the value of the variable
                          needs to change. As WASM builder instructs `cargo` to watch for file changes
                          this environment variable should only be required in certain circumstances.
-- `WASM_BUILD_RUSTFLAGS` - Extend `RUSTFLAGS` given to `cargo build` while building the WASM binary.
+- `WASM_BUILD_RUSTFLAGS` - Extend `RUSTFLAGS` given to `cargo build` while building the wasm binary.
+- `WASM_BUILD_NO_COLOR` - Disable color output of the wasm build.
+- `WASM_TARGET_DIRECTORY` - Will copy any build wasm binary to the given directory. The path needs
+                           to be absolute.
 
 Each project can be skipped individually by using the environment variable `SKIP_PROJECT_NAME_WASM_BUILD`.
 Where `PROJECT_NAME` needs to be replaced by the name of the cargo project, e.g. `node-runtime` will
 be `NODE_RUNTIME`.
 
-### Prerequisites:
+## Prerequisites:
 
 WASM builder requires the following prerequisities for building the WASM binary: