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

---------

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

targets/f7/application_ext.ld

@@ -1,54 +1,47 @@
 FORCE_COMMON_ALLOCATION
 
-SECTIONS
-{
-	.text 0x00000000 : ALIGN(4)
-	{
-		*(.text)
-		*(.stub)
-		*(.text*)
-		*(.text.*)
-		*(.text._*)
+SECTIONS {
+    .text 0x00000000 : ALIGN(4) {
+        *(.text)
+        *(.stub)
+        *(.text*)
+        *(.text.*)
+        *(.text._*)
 
-		KEEP (*(.init))
-		KEEP (*(.fini))
-	}
+        KEEP (*(.init))
+        KEEP (*(.fini))
+    }
 
-	.rodata :
-	{
-		*(.rodata)
-		*(.rodata1)
-		*(.rodata.*)
-	}
+    .rodata : {
+        *(.rodata)
+        *(.rodata1)
+        *(.rodata.*)
+    }
 
-	.data :
-	{
-		*(.data)
-		*(.data1)
-		*(.data.*)
-	}
+    .data : {
+        *(.data)
+        *(.data1)
+        *(.data.*)
+    }
 
 
-	.bss :
-	{
-		*(.bss)
-		*(.bss*)
-		*(.sbss)
-		*(.sbss*)
-		*(COMMON)
-	}
+    .bss : {
+        *(.bss)
+        *(.bss*)
+        *(.sbss)
+        *(.sbss*)
+        *(COMMON)
+    }
 
-	.ARM.attributes :
-	{
-		*(.ARM.attributes)
-		*(.ARM.attributes.*)
-	}
+    .ARM.attributes : {
+        *(.ARM.attributes)
+        *(.ARM.attributes.*)
+    }
 
-	/DISCARD/ :
-	{
-		*(.comment)
-		*(.comment.*)
-		*(.llvmbc)
-		*(.llvmcmd)
-	}
+    /DISCARD/ : {
+        *(.comment)
+        *(.comment.*)
+        *(.llvmbc)
+        *(.llvmcmd)
+    }
 }