Added Generic flight controllers Sub menu

[darkspr1te]

Added basic Afroflight Rev 5 board variant
Added generic flight controller menu only
Added build options only
116b1c2

[fpistm]

You can refers to this to help on applying asrtyle:
https://github.com/stm32duino/wiki/wiki/Astyle

[fpistm]

Hi @darkspr1te
could you update your PR with my comments?
Thanks

[fpistm]

@darkspr1te
please remove all couple of :

#ifndef ARDUINO_BLUEPILL_F103C6
#endif 

and the last 2 astyle issues:

diff --git a/variants/AFROFLIGHT_F103CB/variant.cpp b/variants/AFROFLIGHT_F103CB/variant.cpp
index 30abde0..22f1b30 100644
--- a/variants/AFROFLIGHT_F103CB/variant.cpp
+++ b/variants/AFROFLIGHT_F103CB/variant.cpp
@@ -104,7 +104,7 @@ extern "C" {
   */
 WEAK void SystemClock_Config(void)
 {
-//Board has 12mhz xtal, iám currenlty using HSI internal xtal , i've not figured settings for external 12mhz
+  //Board has 12mhz xtal, iám currenlty using HSI internal xtal , i've not figured settings for external 12mhz
   RCC_OscInitTypeDef RCC_OscInitStruct;
   RCC_ClkInitTypeDef RCC_ClkInitStruct;
   RCC_PeriphCLKInitTypeDef PeriphClkInit;
diff --git a/variants/AFROFLIGHT_F103CB/variant.h b/variants/AFROFLIGHT_F103CB/variant.h
index 4eb69af..5b5ffc5 100644
--- a/variants/AFROFLIGHT_F103CB/variant.h
+++ b/variants/AFROFLIGHT_F103CB/variant.h
@@ -153,7 +153,7 @@ extern "C" {
  * BEEP        PA12; //Connected to Beep out transistor on 6 pin header
  *
  */
-  
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

It seems you do not take in account all my review ( comments to remove,...)

[fpistm]

Replaced by #616