v2.1.0: Multi-partition FAT; Improved Build System

Changelog

• Undefined reference with GCC5+
• Support Raspberry Pi and provide binary distribution as Debian package
• Compilation failure in COG mode on fixed versions of PropGCC
• Stop setting C/C++ standard manually and use CMAKE_CXX_STANDARD
• FAT Filesystem classes fail if there are multiple partitions on the device
• Support CMake 3.4+
• Provide rc_time equivalent on PropWare::Pin class
• Provide standalone package with necessary CMake files for independent CMake dist.
• Simple library's libwavplayer is not compiled with speed optimization
• Provide EEPROM class
• Need create_library function similar to create_executable
• Create function to view binary size
• FatFS: Support partitions other than 0
• Add Spin support to CMake build system