[FL-2832] fbt: more fixes & improvements (#1854)

* github: bundling debug folder with scripts; docs: fixes & updates; fbt: added FAP_EXAMPLES variable to enable building example apps. Disabled by default. fbt: added TERM to list of proxied environment variables
* fbt: better help output; disabled implicit_deps_unchanged; added color to import validator reports
* fbt: moved debug configuration to separate tool
* fbt: proper dependency tracker for SDK source file; renamed linker script for external apps
* fbt: fixed debug elf path
* fbt: packaging sdk archive
* scripts: fixed sconsdist.py
* fbt: reworked sdk packing; docs: updates
* docs: info on cli target; linter fixes
* fbt: moved main code to scripts folder
* scripts: packing update into .tgz
* fbt, scripts: reworked copro_dist to build .tgz
* scripts: fixed naming for archived updater package
* Scripts: fix ぐるぐる回る

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

scripts/fbt_tools/ccache.py

@@ -0,0 +1,14 @@
+def exists():
+    return True
+
+
+def generate(env):
+    if ccache := env.WhereIs("ccache"):
+        env["CCACHE"] = "ccache"
+        env["CC_NOCACHE"] = env["CC"]
+        env["CC"] = "$CCACHE $CC_NOCACHE"
+        # Tricky place: linking is done with CXX
+        # Using ccache breaks it
+        env["LINK"] = env["CXX"]
+        env["CXX_NOCACHE"] = env["CXX"]
+        env["CXX"] = "$CCACHE $CXX_NOCACHE"