Fix random crashes and add export HTML table option

• fix #116 crash on files in readonly folder or long path names
• Convert Data new option, HTML table
• Analyze Data report, fixed min/max decimal sometimes incorrect
• Various minor fixes

Select Columns replaces Count Unique and various updates

• #95 #96 new Select Columns dialog, replaces "Count unique" dialog
• #104 #100 User file extensions include default ssv tsv skv
• #93 more gracefully handle 2GB+ too-large files, thanks to @molsonkiko
• #90 Don't do full file scan for non-csv files unless explicitly requested
• Target framework update from .NET 4.0 to .NET 4.8
• Convert Data, various SQL improvements
• Disable Sort/Add/Reformat when no valid metadata
• Improved Fixed Width detection, check consecutive zeroes
• Various updates and QoL fixes

Minor updates

• Sort Data, enumeration columns now sort according to code index
• Metadata scripts, now includes sort examples
• SQL scripts, placeholders for column comments
• Settings button on docked window

Reformat bugfix, improved enumeration, sort on length

• #91 Bugfix: Reformat, Sort and Add Column no longer changes CRLF to LF
• #89 Improved enumeration detection
• Sort dialog, new option Sort on length of value
• Sort and Add Column, allow resize of dialogs for long column names
• Generate scripts, various improvements
• Various bugfixes

Support PowerShell and datadictionary CSV and various updates

• #80 Settings dialog, Colors button appearance
• #70 Convert data, new option AutoSyntaxLimit
• Generate metadata, support PowerShell script
• Generate metadata, support datadictionary CSV
• Manual detect, new button to copy column positions
• Rename setting NullValue to NullKeyword
• Update Donate button link
• Various updates and bugfixes

Support enum/coded values and various updates

• #63 Support for enum/coded values
• #64 Analyse Data Report show correct date range
• #67 #69 Fix rare crashing situation due to transparent cursor line setting
• #66 Syntax highlighting with special separator character
• Convert to SQL, PostgreSQL improvements, enum and table comment
• Generate Python/R, enum support
• Generate W3C CSV Schema JSON various improvements
• Settings dialog, remove userpref dialog values
• Various updates and bugfixes

Comment character and dark mode support

• #48 Improved comment character support
• Dark mode dialogs
• Various bugfixes and updates

Syntax Highlighting fix, new SkipLines feature and quoted string improvements

• #50 Bugfix for Syntax Highlighting and Windows code page 936
• #46 New SkipLines feature and support for line comment character
• #53 Syntax highlighting bugfix when editing quoted values
• #51 More consistent use of trim/quote settings
• #54 Allow user to delete column
• Split on character, new option split on Nth occurrence
• Replace buymeacoffee link with donate PayPal link
• Various bugfixes and updates

Manual fixed width positions, syntax highlighting toggle button, change font in docked window

• Detect fixed width, allow manual column positions
• Button to toggle syntax highlighting
• Allow user to change font in docked window textboxes
• Minor bugfixes

Sort data Edit column various fixes

• Apply quotes bugfix, also values that contain CrLf character
• Sort data and split column, use quotes correctly
• Sort data and split column, also support fixed width
• Various minor updates