Major rewrite: less repetition (#101)

* first step of rewriting: at least it compiles™

* fix tabs/spaces

* fix dabort on load

* fix preview crash

* sorting isnt done outside of loading

* step one of making remake_file useless

* camera/qr code cleanup

* fix dabort when folder is empty, and bring back preview optimization

* fix button for switching modes and show mode when folder is empty

* fix scanning qrs

* no more splash discrimination

* add debug helpers

* fix theme installing
turns out that wasnt such a good idea

* fix battery icon

* mistake

* themeplaza compatibility

* make use of load_data

* don't drink and copy-paste, kids

* fix user-agent

* remove useless

* cleanup includes

* not even used

* add splash buttons

* upgrade buttons drawing

* fix controls while preview is up

* improve positions

Makefile

@@ -55,7 +55,7 @@ CFLAGS	:=	-g -Wall -Wextra -O2 -mword-relocations \
 
 revision := $(shell git describe --tags --match v[0-9]* --abbrev=8 | sed 's/-[0-9]*-g/-/')
 
-CFLAGS	+=	$(INCLUDE) -DARM11 -D_3DS -D_GNU_SOURCE -DVERSION="\"$(revision)\""
+CFLAGS	+=	$(INCLUDE) -DARM11 -D_3DS -D_GNU_SOURCE -DVERSION="\"$(revision)\"" -DUSER_AGENT="\"$(APP_TITLE)/$(revision)\""
 
 CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11