New "looking Glass" app

Capable of showing a cascade with full bandwidth scan. You can select Min and Max Mhz for the cascade.

You can move a marker so to (aproximately) know  a particular frequency on the cascade. If you press the select button, the app will jump into the RX -> AUDIO app, already tuned into the just "marked" frequency.

This first version SURELY has space for lots of optimizations and improvement in general.

firmware/application/ui_navigation.cpp

@@ -81,7 +81,7 @@
 #include "tpms_app.hpp"
 
 #include "core_control.hpp"
-
+#include "ui_looking_glass_app.hpp"
 #include "file.hpp"
 #include "png_writer.hpp"
 
@@ -527,6 +527,7 @@ SystemMenuView::SystemMenuView(NavigationView& nav) {
 		{ "Tools",		ui::Color::cyan(),			&bitmap_icon_utilities,	[&nav](){ nav.push<UtilitiesMenuView>(); } },
 		{ "Options", 	ui::Color::cyan(),			&bitmap_icon_setup,	  	[&nav](){ nav.push<SettingsMenuView>(); } },
 		{ "Debug",		ui::Color::light_grey(),	&bitmap_icon_debug,		[&nav](){ nav.push<DebugMenuView>(); } },
+		{ "Lookin'Glass",	ui::Color::red(),		&bitmap_icon_search,	[&nav](){ nav.push<GlassView>(); } },
 		{ "HackRF", 	ui::Color::cyan(),			&bitmap_icon_hackrf,	[this, &nav](){ hackrf_mode(nav); } },
 		//{ "About", 		ui::Color::cyan(),			nullptr,				[&nav](){ nav.push<AboutView>(); } }
 	});