Add optionality for parameters

This commit allows for parameters that does not require any arguments to
be provided in function calls. It changes collection syntax where
parameters are list of objects instead of primitive strings. A
parameter has now 'name' and 'optional' properties. 'name' is required
and used in same way as older strings as parameter definitions.
'Optional' property is optional, 'false' is the default behavior if
undefined. It also adds additional validation to restrict parameter
names to alphanumeric strings to have a clear syntax in expressions.

tests/unit/stubs/FunctionCallArgumentStub.ts

@@ -0,0 +1,15 @@
+// tslint:disable-next-line:max-line-length
+import { IFunctionCallArgument } from '@/application/Parser/Script/Compiler/FunctionCall/Argument/IFunctionCallArgument';
+
+export class FunctionCallArgumentStub implements IFunctionCallArgument {
+    public parameterName = 'stub-parameter-name';
+    public argumentValue = 'stub-arg-name';
+    public withParameterName(parameterName: string) {
+        this.parameterName = parameterName;
+        return this;
+    }
+    public withArgumentValue(argumentValue: string) {
+        this.argumentValue = argumentValue;
+        return this;
+    }
+}