Some new features and bug fixes in thecl

[Priw8]

New features (th10+ only):

• difficulty switch expressions: wait(60:50:40:30); ->

  !E
    60;
  !N
    50;
  !H
    40;
  !LO /* in th10-th128 it's just !L */
    30;
  !*
    wait([-1]);

  last parameter always gets all remaining diffs, so do 10:20 to get just

  !E
    10;
  !NHLO
    20;
  !*

  or 1:2:3:4:5 to split lunatic and overdrive (for games that have it)
  this only supports basic integer/float literals, putting variables/expressions inside will not work (I might add that later)

• no forced typecast for passing expressions to ins calls: basically now you don't have to do wait(_S(2+2)), wait(2+2) works just fine

• easy to write float literals that represent radians: rad(180.0f) -> 3.14159...f (since this is just a way of representing a float value and not an actual function, you can't put variables/expressions in it)

• syntax for binary integer literals: 0b1001 -> 9

• added forced sub calls by name - @mySub(); compiles into ins_11("mySub");, even if no sub of that name exists in the current file (can also do @mySub() async; to use ins_15 instead)

• declare variables anywhere in the sub and don't require var; at the beginning (ins_40 is prepended to the list in sub_finish automatically)

• declare & assign variables in 1 line with var $myVar = 1;

• automatically add ins_10 at the end of the sub if there is no ins_1/ins_10 present

• since 3 last features make thecl add instructions automatically, simple creation mode was added to disable them (pass -s in args when running thecl to enable this mode)

• added an error message when a variable with a duplicate name is declared

• added times loop known from some screenshots of ZUN's ECL:

  times(10) {
    ins_whatever();
  }

  since the times loop requires one of the earlier features enabled to work (as it automatically creates a counter variable), it's not available in simple creation mode

Fixes:

• fixed passing expressions to sub calls by name - expression_output wasn't called and the expressions ended up being compiled AFTER the call instead
• fixed sub calls by name without any parameters (earlier it would call list_free_nodes with a NULL pointer, which crashed thecl)
• fixed some minor issues where syntax wouldn't get accepted (break; no longer requires an instruction before it, rank flags don't require an instruction after them etc)
• fixed pre-th10 unused difficulty flag dumping (dump !457 instead of !XYZ)