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When you get a game over, save your high score to a file so that we can
display it on the leaderboard. The saved scores get sorted from highest
to lowest.
If we don't have your name yet (saved to a separate file), we prompt you
for it.
This means that you can only have one player (name) per installation.
Not the best scenario because maybe you have multiple people playing on
your computer, but I made a judgement call to do it this way so we don't
have to keep prompting the player for their name every time they get a
Game Over. That could get annoying fast.
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Pad these 2 status lines with spaces to the right of their string values
so that their background colours extend to the full width of the game
board.
First tried `len()`, then `strlen()` when counting characters in
`padding#RightPadding()` but turns out those deal with bytes and the
player character is a multi-byte character so we would come up sort on
spaces for padding in the Lives line because the player diamond counts
for double. To get around this, used `strchars()` which gives us a count
of the characters instead of the bytes.
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* Create life.vim to keep track of lives
* Players start with 3 lives
* Add increment and decrement functions for lives because they'll be
useful in the future (although there's a more immediate need for the
decrement function)
* Render lives at the bottom of the board
* Move the score line down so that it appears just below the life count
display
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* Create score.vim to keep track of score and group scoring-related
functions
* Increment player score when an enemy is defeated. The point count is
based on a base value and a multiplier. Currently set to 1 for each
such that each enemy is always worth 1 point. The multiplier is there
so that as time increases we can increase the multiplier and increase
the value of an enemy the longer the player plays.
* Render score to the screen so that it's visible to players.
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