New thanm spec format (also featuring th18 support)

[Priw8]

Replaces the spec format used by previous versions of thanm with a completely new one, using bison and flex for parsing. The format itself is similar to the one used by thecl. The old format support was completely removed, because due to some format changes it would not work properly anyway. Trying to use an old format spec file for ANM creation will result in the following message being displayed:

thanm: filename.spec: the spec file was made using an old version
of thanm and uses the old format, which is no longer supported.
Please use the old version of thanm to create the ANM file, and
re-dump it using this version.

Features of the new format:

• new thecl-like syntax
• anmmaps for defining mnemonic names
• default values for numerous entry fields if they are not specified
• automatically use width/height of the image if it's not specified
• labels for jump instructions
• refer to sprites/scripts by name; they get automatically changed to IDs when compiling
• expressions (evaluated compile-time when possible, otherwise automatically uses ANM registers and appropriate operator instructions)
• variables: can use the registers manually but can also declare named variables int myVar = 0; and they will automatically have a register assigned
• global definitions: same as thecl, global someGlobal = 10;
• timeof(labelname) offsetof(labelname), spriteof(spritename), scriptof(scriptname) operators: allow explicitly getting value of a symbol
• directives:
  • #version n: set default version for all following entries to n
  • #include "filename.spec": include the given file
  • #anmmap "filename.anmm": load an anmmap
  • #symbol_prefix "prefix": explained below
• the -s symbol-filename option can be used to export script name to ID mapping in the global definition format (to later be #included in ECL source files). The names can be prefixed using the name set by using the #symbol_prefix directive.