This mainly moves the STM32 timers' code to the common area.

F2 and F4 have a common section to deal with the options register (TIM2 and TIM5 only)
L1 has been made common with timer_common_all as its options register has very different settings to F2/F4. Code is in the L1/timer.c L1/timer.h files

Note that F3 and F05 timers should fit into this scheme, with F3 having additional features.

Bundled with this is L1/pwr.h to change a documentation setting
Also all the Doxyfiles have added "ENABLE_PREPROCESSING = NO" to fix a problem introduced by commit 118.

lib/stm32/l1/Makefile

@@ -32,11 +32,11 @@ CFLAGS		= -Os -g \
 		  -ffunction-sections -fdata-sections -MD -DSTM32L1
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		= rcc.o desig.o crc.o usart.o exti2.o flash.o timer.o
-OBJS +=     gpio_common_all.o gpio_common_f24.o spi_common_all.o crc_common_all.o
-OBJS +=     dac_common_all.o usart_common_all.o iwdg_common_all.o i2c_common_all.o
-OBJS +=     pwr_common_all.o pwr.o
-OBJS +=     rtc_common_bcd.o
+OBJS		= crc.o desig.o exti2.o flash.o rcc.o usart.o
+OBJS            += crc_common_all.o dac_common_all.o gpio_common_all.o
+OBJS            += gpio_common_f24.o i2c_common_all.o iwdg_common_all.o
+OBJS            += pwr_common_all.o pwr.o rtc_common_bcd.o
+OBJS            += spi_common_all.o timer_common_all.o usart_common_all.o
 
 VPATH += ../../usb:../:../../cm3:../common