Code Cleanup: unused includes, useless checks, unused variables, etc... (#3696)

* Remove unnecessary checks
* Sublime: never insert missing headers
* Cleanup furi defines use
* Cleanup startup. Cleanup linker scripts. Explicitly define all interrupts hadlers, including uninmplemented one.
* Startup routine in C
* Drop assembler startup
* Move linker defines to stm32wb55_linker.h, cleanup naming, unify usage. Mpu: protect last 32b of main stack. Document various obscure things.
* Move furi_hal_switch documentation to appropriate place, use 0x0 for updater jump.
* UnitTests: move all temporary test files into tmp folder

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Co-authored-by: SG <who.just.the.doctor@gmail.com>

targets/furi_hal_include/furi_hal.h

@@ -55,9 +55,15 @@ void furi_hal_deinit_early(void);
 /** Init FuriHal */
 void furi_hal_init(void);
 
-/** Transfer execution to address
+/** Jump to the void*
  *
- * @param[in]  address  pointer to new executable
+ * Allow your code to transfer control to another firmware.
+ *
+ * @warning    This code doesn't reset system before jump. Call it only from
+ *             main thread, no kernel should be running. Ensure that no
+ *             peripheral blocks active and no interrupts are pending.
+ *
+ * @param      address  The System Vector address(start of your new firmware)
  */
 void furi_hal_switch(void* address);
 

targets/furi_hal_include/furi_hal_mpu.h

@@ -14,8 +14,9 @@ extern "C" {
 
 typedef enum {
     FuriHalMpuRegionNULL = 0x00, // region 0 used to protect null pointer dereference
-    FuriHalMpuRegionStack = 0x01, // region 1 used to protect stack
-    FuriHalMpuRegion2 = 0x02,
+    FuriHalMpuRegionMainStack = 0x01, // region 1 used to protect Main Stack
+    FuriHalMpuRegionThreadStack =
+        0x02, // region 2 used to protect currently executed RTOS Thread Stack
     FuriHalMpuRegion3 = 0x03,
     FuriHalMpuRegion4 = 0x04,
     FuriHalMpuRegion5 = 0x05,