HGL Suite Code

* bumped version to 0.4.48

Version 0.4.48

cont'd code review with clang++ and -Weverything (module types, partly)

cont'd code review with clang++ and -Weverything (module interpreter, partly)

cont'd code review with clang++ and -Weverything (module compiler)

cont'd code review with clang++ and -Weverything (module parser)

cont'd code review with clang++ and -Weverything (module imageoutput)

cont'd code review with clang++ and -Weverything (module control)

cont'd code review with clang++ and -Weverything (module common)

bug fix introduced by code review