LPC11U35_501 removed from uVision exporter targets

uvision4_lpc11u35_501.uvproj.tmpl is missing so the export fails.

I am removing this so that the option to export is removed.
Restructure and cleanup targets.py for easier navigation
Remove "Silicon" from comments
[TARGET_DISCO_F334C8] reorder structure - part1

Moving targetspecific files to new folder in new structure
[TARGET_DISCO_F334C8] reorder structure - part2

Removing cmsis files.
Merge pull request #645 from stephenpaulger/master

Tools: LPC11U35_501 - uVision exporter targets not available
Merge pull request #647 from screamerbg/master

Tools: Restructure targets.py for easier navigation
Merge pull request #644 from bcostm/master

Targets: Nucleo: Update of STM32L0 Cube driver + NUCLEO_L053R8 hal
Merge pull request #650 from ohagendorf/reorder_f3xx

Targets: DISCO_F334 - Reorder f3xx
Merge branch 'master' of https://github.com/mbedmicro/mbed
[NUCLEO_L053R8] Add IAR exporter