[DOXYGEN] Correct generating docs for STM32F0 and STM32F3
[DOXYGEN] Add STM32F3 to the headers of documentation pages
[DOXYGEN] Add links to the HTML pages for easy debugging of pages
[DOXYGEN] EFM32 link typo bugfix
[DOXYGEN:STM32F3] fix the conflict strings.
[usb-f103] Use the "modern" /rcc include instead of f1.

The f103 usb core should be usable on the l1 as well, and the /f1/rcc
isn't explicitly required anymore.  This is an important change to be
able to share the driver.
[stm32-l1] Include f103 usb driver in build.

Tested with the h103 cdcacm demo (originally targetting an F103) on a
custom L1 based board and it enumerates successfully.
[stm32f2] fix missing USB symbols
[stm32f3] Properly turn on the FPU

The vector chipset file was added, but not included in the dispatcher.
Fixes github issue #201