* [build][CMake] Use `find_package(Git)` to confirm existence before trying to use git for version stamp; Use friendlier detection of grep executable on Windows; Use "del" on Windows instead of "rm".
* [build][Windows] Include dirent and msinttypes headers in source tree.
* Remove grep dependency for lua exports generation
* Sneaky pythons hiding in code.
* [build] Change `git_id` macro to skip check if no git directory is present, also now fails gracefully; Fix `today` macro on Windows; Report git revision; Make sure QtSvg module is found.
* [TravisCI] Build using avr-gcc 4.9.2 (up from 4.8.2). Relies on https://github.com/opentx/opentx/pull/4169 . Fixes all linker warnings, makes clean build.
* [build] Add ARM/AVR compiler version check/display and a workaround for avr-gcc linker warnings when using WARNINGS_AS_ERRORS=true.
* [TravisCI] Enable -Werror on all build targets (WARNINGS_AS_ERRORS=true).
* [build] CMake script updates:
Enable WARNINGS_AS_ERRORS option for all targets (not just firmware);
Consolidate some C/CXX flag settings for firmware target, avoid duplication/redundancy;
All warning flags are now passed to linker (GCC only);
Add a "build report" for each main target showing compiler, flags, and defines, with verbosity controlled by new VERBOSE_CMAKELISTS option;
Added properties to PCB, TRANSLATIONS, and a few other options (makes option selector lists in cmake-gui);
Add macro for conditionally adding C++11 flag;
Silence CMake >3.0 warnings about CMP0054 policy not being set;
Reverts AVR linker -Werror workaround;
Misc. cleanup/consolidation.
* [build] More CMakeLists updates:
Silence superfluous "CRT_SECURE" series MSVC warnings;
Formalize finding pthread lib/dll on MSVC builds and fix some issues with install target script;
Add property string lists to more options;
Quotes some paths with possible spaces, & other minor cosmetics.
* [build] firmware/bootloader: Remove remaining CMake default compiler flags and add FIRMWARE_C[XX}_FLAGS[_DEBUG] options for user to specify additional flags. Also move ASM language call to silence CMake warning w/MSVC.
* [build] Workaround bogus "uninitialized" warnings from AVR linker.
* [tests] Add custom printer for less verbose gtest output (use --verbose option to revert to gtest default).
* [build] Use less verbose CMake output for TravisCI builds. Formalize search for gtest code and enable gtests target on WIN32-GCC. Minor language fix.
