[FL-2937] Remove resources from API to prevent frequent API version increase (#1935)

* Remove all icons from API
* Music player: icons
* Signal generator: icons
* Bt hid: icons
* Weather station: icons
* Picopass: icons
* File browser test: icons
* Example images: documentation
* Remove global assets header
* Fix picopass

Co-authored-by: あく <alleteam@gmail.com>

applications/plugins/signal_generator/application.fam

@@ -9,4 +9,5 @@ App(
     order=50,
     fap_icon="signal_gen_10px.png",
     fap_category="Tools",
+    fap_icon_assets="icons",
 )

applications/plugins/signal_generator/views/signal_gen_pwm.c

@@ -1,6 +1,7 @@
 #include "../signal_gen_app_i.h"
 #include "furi_hal.h"
 #include <gui/elements.h>
+#include <signal_generator_icons.h>
 
 typedef enum {
     LineIndexChannel,