Japt 1.3: string compression, Unicode shortcuts, and many new functions

Over the last few days, vihanb and I have implemented a bunch of new features, bug fixes and enhancements:

• String functions:
  • d - Recursive replace
  • e - Single-char replace and multiple-replace
  • o - Select chars
• Array functions:
  • u - Unshift
  • v - Shift
• Number functions:
  • a - absolute value
  • j - primality test
  • k - prime factorization
  • l - factorial
• Math functions:
  • t - atan2
  • g - fibonacci
  • r - random
  • P - PI
• String compression (using the shoco library):
  • Oc - compress ASCII text
  • Od - decompress pre-compressed text
  • text wrapped in backticks - auto-decompress
• Unicode shortcuts:
  • ¡ - Um@
  • ¢ - Us2
  • £ - m@
  • ¤ - s2
  • ¥ - ==
  • ¦ - !=
  • § - <=
  • ¨ - >=
  • © - &&
  • ª - ||
  • « - &&!