added missing keywords + fixed missing source text for boolean primaries

fixed grammar for path + added missing string quote escaping (still not perfect: escape sequence is in syntax tree)

fixed path parser not writing length for a single slash as path

implemented minimal executor features and added missing ucx files

renamed GET to SELECT in davql syntax

added expression executor prototype

fixed: comparison operator info has been incorrectly written to type field

expression compiler generates byte code

added where clause compiler prototype

secured malloc / calloc calls

fixed statement type for logical expressions without operator + prepared OOM handling

implemented order by parser

added initial code for config commands

fixed paranthsis ambiguity for logical and normal expressions

fixed null pointer access on end of token stream by adding a special END token to the stream

fixed logical expression parser

completed logical expression parser - NEED TO TEST A LOT!

added function call parser + fixed some memory management mistakes

completed field list parser + error messages do now provide more context information based on the source string

minimized ucx subset

parser for ParExpression

update ucx

added syntax tree display to debugger + expression parser saves source text in every node

fixed parsing of binary expressions did not yield the correct type

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