patterns: Rewrite evaluation engine (#306)

* patterns: Rewrite most of the evaluator to mainly use polymorphism instead of just RTTI

* patterns: Fixed a couple of AST memory leaks

* patterns: Parse string operations correctly

* patterns: Various fixes and cleanup

* patterns: Implement primitive function definitions

Function parameters now need to provide their type in the definition

* patterns: Added function variable definition and assignment

* patterns: Added remaining function statements

* patterns: Added unsized and while-sized arrays

* patterns: Added multi variable declarations to functions

* patterns: Added std::format built-in function

* patterns: Allow passing custom types to functions

* patterns: Added attributes and new "format" attribute

* patterns: Use libfmt for std::print instead of custom version

* patterns: Remove unnecessary string compare function

* pattern: Fix preprocessor directives

* patterns: Fix unit tests

* patterns: Added cast expression

* patterns: Handle endianess in function parameters

* patterns: Added casting to different endian

* patterns: Added 'str' type for functions

libstdpl/math.pl

@@ -0,0 +1,47 @@
+namespace std::math {
+
+	fn min_u(u128 a, u128 b) {
+		return (a < b) ? a : b;
+	};
+	
+	fn min_i(s128 a, s128 b) {
+		return (a < b) ? a : b;
+	};
+	
+	fn min_f(double a, double b) {
+		return (a < b) ? a : b;
+	};
+	
+	
+	fn max_u(u128 a, u128 b) {
+		return (a > b) ? a : b;
+	};
+	
+	fn max_i(s128 a, s128 b) {
+		return (a > b) ? a : b;
+	};
+	
+	fn max_f(double a, double b) {
+		return (a > b) ? a : b;
+	};
+	
+	
+	fn abs_i(s128 value) {
+		return value < 0 ? -value : value;
+	};
+	
+	fn abs_d(double value) {
+		return value < 0 ? -value : value;
+	};
+	
+	
+	fn ceil(double value) {
+		s128 cast;
+		cast = value;
+		
+		return cast + 1;
+	};
+
+}
+
+std::print("{}", std::math::ceil(123.6));