basic user sample functionality added.
snapshot commit.
still some bugs:
-upload breaks avr sd card access
-no fm oscillator code
-problem in name construction for f_read()
-...
fixed sample upload codec crash
fixed filename problem
fixed broken avr sd access after sample upload
fixed sample upload only works once bug
added user sample code to fm osc
added sample upload stops sequencer
Merge branch 'master' of https://github.com/rudeog/LXR into develop

Conflicts:
	front/AVR/Hardware/SD/SPI_routines.c
	front/AVR/IO/uart.c
	front/AVR/Menu/menu.c
	mainboard/firmware/DrumSynth_FPU/Debug/makefile
	mainboard/firmware/DrumSynth_FPU/Debug/sources.mk
	mainboard/firmware/DrumSynth_FPU/src/DSPAudio/Oscillator.h
	mainboard/firmware/DrumSynth_FPU/src/MIDI/MidiMessages.h
	mainboard/firmware/DrumSynth_FPU/src/MIDI/frontPanelParser.c
	mainboard/firmware/DrumSynth_FPU/src/SampleRom/SampleMemory.c
	mainboard/firmware/DrumSynth_FPU/src/config.h
	mainboard/firmware/DrumSynth_FPU/src/main.c
	mainboard/firmware/UartBootloader_FPU/stm32_flash.ld
refactoring merge
updated changelog, readme and version no.
fixed trigger out init
fixed pitch mod EG affecting final OSC pitch
leave edit/detail view when changing sub pages
leave detail/edit view when knob is moved
added step position reset to zero on pattern change
added new firmware image v0.27
refactoring
refactoring