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/f1/Makefile

@@ -32,13 +32,17 @@ CFLAGS		= -Os -g \
 		  -ffunction-sections -fdata-sections -MD -DSTM32F1
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		= rcc.o gpio.o adc.o flash.o rtc.o dma.o exti.o ethernet.o \
-		  usb_f103.o usb.o usb_control.o usb_standard.o can.o \
-		  timer.o usb_f107.o desig.o pwr_common_all.o \
-		  usb_fx07_common.o \
-		  gpio_common_all.o dma_common_f13.o spi_common_all.o \
-		  dac_common_all.o usart_common_all.o iwdg_common_all.o \
-		  i2c_common_all.o crc_common_all.o
+
+OBJS		= adc.o can.o desig.o exti.o ethernet.o flash.o gpio.o \
+                  rcc.o rtc.o
+
+OBJS            += crc_common_all.o dac_common_all.o dma_common_f13.o \
+                   gpio_common_all.o i2c_common_all.o iwdg_common_all.o \
+                   pwr_common_all.o spi_common_all.o \
+                   timer_common_all.o usart_common_all.o
+
+OBJS            += usb.o usb_control.o usb_standard.o usb_f103.o usb_f107.o \
+                   usb_fx07_common.o
 
 VPATH += ../../usb:../:../../cm3:../common