Various improvements: Toolbox, Updater and Unit Tests. (#2250)

* Toolbox: add seek to character stream method. UpdateUtils: reverse manifest iterator. UnitTests: more unit tests.
* Target: bump API version. Updater: delete empty folders from manifest before resource deployment.
* UnitTests: use manifest from unit_tests folder instead of global one
* Make PVS happy
* sector cache: allocate always
* Better PVS config for manifest.c
* PVS: Move exception outside of condition
* PVS: remove confusing condition

Co-authored-by: SG <who.just.the.doctor@gmail.com>

firmware/targets/f7/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,11.5,,
+Version,+,11.6,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/cli/cli.h,,
 Header,+,applications/services/cli/cli_vcp.h,,
@@ -2480,6 +2480,7 @@ Function,+,stream_read_line,_Bool,"Stream*, FuriString*"
 Function,+,stream_rewind,_Bool,Stream*
 Function,+,stream_save_to_file,size_t,"Stream*, Storage*, const char*, FS_OpenMode"
 Function,+,stream_seek,_Bool,"Stream*, int32_t, StreamOffset"
+Function,+,stream_seek_to_char,_Bool,"Stream*, char, StreamDirection"
 Function,+,stream_size,size_t,Stream*
 Function,+,stream_split,_Bool,"Stream*, Stream*, Stream*"
 Function,+,stream_tell,size_t,Stream*