Build 190303 (preview)

• conemu#1840: Fix hung during startup if Environment contains echo -x ....
• The -FontSize is better name to change font size switch.
• Allow to do Copy all from load dump screen.
• conemu#1833: Fix border rendering issues (bar placement).
• Icon was not autoloaded for some tabs (e.g. pwsh.exe).
• Add default tasks for ‘PowerShell Core’.
• Some internal changes in default tasks generation.