nintendoswitch: Add env parser and removed unused stuff

*	Heap allocation based on available ram
*	Added homebrew launcher parser (for overriden heap)
*	Removed unused stuff (moved to gonx)
*	Kept require code at minimum to work in a real device
*	Moved everything to a single file

targets/nintendoswitch.ld

@@ -17,6 +17,7 @@ SECTIONS
     KEEP(*(.text.jmp))
 
     . = 0x80;
+    KEEP(*(.text.start))
 
     *(.text .text.*)
     *(.plt .plt.*)