* Added hdl_checker support
* Added hdl_checker tests
HDL Checker searches for files when no config file is found, which could lead to very long searches when the user is not really on a project setting
* Adds an option to pass additional arguments to the verilog/verilator linter
The new otion is g:ale_verilog_verilator_options
+ doc
* Spell check verilog linter doc file
* Add entries to the verilog linters in the doc table of content
* Vader test for verilog/verilator linter args option verilog_verilator_options