apply early return to save horizontal space

move variable definitions closer to their use
limit variable scope
simplify branching by moving CT_TPAREN_OPEN check into SS_DANGLE if condition

limit variable scope

- limit range of possible input values by making the frm param a const reference
- dereferences frm pointer in when calling insert_vbrace,
  adds nullptr guards for that
- add early returns to save horizontal space
- (personal preference) replace ugly do while loop

- limit range of possible input values by making the frm param a const reference
- remove unused pc param
- add early returns to save horizontal space

- move variable definitions closer to their use

- move variable definitions closer to their use
- fix a typo
- limit variable scope
- directly return result from the close_statement function as that will lead to
  the same result in the end

- add newlines to enhance visibillity
- eliminate needless nesting of successive if checks
- apply const to variables

- add down-case 'pse_tos' to int in order to prevent up-casting of the '1' and
  enable possible signed-ness of the to be calculated value
- eliminate needless nesting of successive if checks
- add todo comment for the enum hack, replace cast
- limit variable scope
- add missing nullptr check
- replace C style error string generation with std::cerr stream

- add early returns to save horizontal space

- move variable definitions closer to their use
- replace memset with an aggregate-initialization
- eliminate needless nesting of successive if checks

- add missing nullptr check, throw if frm is nullptr to guard a possible
  re-initialization of frm
- add early returns to save horizontal space
- replace memset with an brace (aggregate) initialization

- (subjective) simplifies function by moving loop flow statements into for loops
  headers

- use vector to store chunk_t* elements, minimizes upfront element
  initialization (testbase uses max 16 elements), allows to handle more elements
  than a fixed max number
- move variable definitions closer to their use

- move variable definitions closer to their use
- limit variable scope

- eliminate needless nesting of successive if checks

- fixes coverity 76006

- eliminate needless nesting of successive if checks
- move variable definitions closer to their use

- move variable definitions closer to their use
- limit variable scope
- eliminate needless nesting of successive if checks

- move variable definitions closer to their use
- limit variable scope
- eliminate needless nesting of successive if checks

- move variable definitions closer to their use
- limit variable scope
- eliminate needless nesting of successive if checks
- replace memset with brace (aggregate) initializer
- combine if checks with identical bodys
- move some single condition checks before multi condition checks in 'if' heads
- remove useless parenthesis pairs

- add early returns to save horizontal space

- add early returns to save horizontal space

- move variable definitions closer to their use
- eliminate needless nesting of successive if checks, simplify if checks

- move variable definitions closer to their use
- remove useless parenthesis pairs
- limit variable scope
- use a safer size_t abs calculation