Added new logic to pl.Lexer to find number of leading spaces by either arithmetic or by finding the index position of the first non-whitespace character. Also added a boolean flag to switch easily between the two methods using ternary logic. Added comments explaining functionality. Fixed code spacing to be more uniform in style.
Added an alternative method for calculating the leading spaces instead of taking the index of the first non-whitespace character. Leaving it commented out, but still there as an alternative in-case something goes wrong w/ the index method.
added helper function fetchLineNumber(editor) to return the line number that the cursor is on and refactored the code to make use of this helper function in various places. Also added function getLineNumber() which will output the current line number the cursor is on.
Further separate commands so that each category of command is in it's
own file. The goal is to keep the number of callbacks defined for each
command to a reasonable amount per file.
