Review changes: add racer.exe dependencies etc

- Changed racer.exe to 32bit
- Added racer dependencies
- Made a separate class to wrap the native racer executable & sanity
checks
- Moved racer exe + dependencies to subdir & made separate
wxs/componentgroup in msi
- Added sanity checks at startup for RUST_SRC_PATH and possibility to
load racer.exe from path
- removed auto-added bracket after Function name completion
- Fixed missing Static completions
- Fix wrong var used in log message when enum parsing failed