fbt: compile_db fixes (#1981)

* fbt: forked compilation_db tool
* fbt: fixes for static analysis
* pvs-studio: ignoring more generic warnings
* fbt: util: added extract_abs_dir
* vscode: added fap-set-debug-elf-root for debug configurations

.vscode/example/launch.json

@@ -38,6 +38,7 @@
             "postAttachCommands": [
                 // "compare-sections",
                 "source debug/flipperapps.py",
+                "fap-set-debug-elf-root build/latest/.extapps",
                 // "source debug/FreeRTOS/FreeRTOS.py",
                 // "svd_load debug/STM32WB55_CM4.svd"
             ]
@@ -59,6 +60,7 @@
                 "set confirm off",
                 "set mem inaccessible-by-default off",
                 "source debug/flipperapps.py",
+                "fap-set-debug-elf-root build/latest/.extapps",
                 // "compare-sections",
             ]
             // "showDevDebugOutput": "raw",
@@ -76,6 +78,7 @@
             "rtos": "FreeRTOS",
             "postAttachCommands": [
                 "source debug/flipperapps.py",
+                "fap-set-debug-elf-root build/latest/.extapps",
             ]
             // "showDevDebugOutput": "raw",
         },
@@ -95,6 +98,7 @@
             ],
             "postAttachCommands": [
                 "source debug/flipperapps.py",
+                "fap-set-debug-elf-root build/latest/.extapps",
             ],
             // "showDevDebugOutput": "raw",
         },