TorqueScript anonymous functions

[crabmusket]

As in this resource and popular other languages. Anonymous functions are great. However, we should probably decide on an identifier for them which is not function, so as to not treat every function as a lambda, but also because JavaScript has shown us that typing out function everywhere is annoying. Additional enhancement would be to allow anonymous function bodies to have no curly braces around them, so we can write very nice short function bodies.

I propose using a simple backslash as the lambda introducer; to whit:

// Using a traditional block;
schedule(1000, 0, \(%name) {
   echo("Hello" SPC %name);
}, "Peter");

Additionally, we should support calling functions from variables:

%sch = "schedule";
%sch(1000, MyObject, myMethod);

%fn = \(%x) %x + 1;
%y = %fn(5);

[JeffProgrammer]

Here's the Torque3D compatible code from that resource found in these 2 commits on my game:

https://github.com/JeffProgrammer/BeyondReality/commit/10ee5c799a1bfa721fd9291553197966a2d51c16

https://github.com/JeffProgrammer/BeyondReality/commit/f492e44b0362eef583f2920dad0aaa2a094e0c49

this will allow you to do the following:

schedule(1000, 0, lambda(%name) {
echo(%name);
}, "Jeff");

[crabmusket]

Working branch. Decided to go with plain old function(). Currently the function name is returned, but not defined until the end of the current script parsing. This means that anon functions can't be used in top-level expressions where they are called immediately - for example, typing in the console call(function(%a) { echo(%a); }, horses);. Fixed in 170a4ea.