fixed meta_decode warnings

meta_decode was issuing warnings (not initialized values) when input was empty string,
string with spaces-only, string with correct marker but without real data
gemu-test-worker - fix for sign int, to enable removal of temp files after ctlr-c
fixed meta_decode warnings

meta_decode was issuing warnings (not initialized values) when input was empty string,
string with spaces-only, string with correct marker but without real data
changelog updated
Merge branch 'development' into fsm_rework