Major Changes to vimrc

Abbreviation
============
  * Modified  => date string to [yyyy.mm.dd]

Functions
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  * Removed   => Warn about Extra Whitespace
  * Removed   => Warn about Tab while ExpandTab
  * Modified  => Highlight Extra Whitespace (Search instead of ErrorMsg)
  * Modified  => Highlight_Extra_Tab (Search instead of ErrorMsg)
  * Added     => Toggle_Line_Number_Mode to handle line numbers

Visual
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  * Removed   => Status line format (Deprecated with tmuxline)

Leader Mappings
===============
  * Modified  => Toggle Highlight Extra Characters to look at “Highlight_Extra*” Functions
  * Added     => Toggle_Line_Number_Mode() global mapping