Helper Functions to get all functions across the given apis

[RobLoach]

A function that will combine some of the APIs together, and remove the duplicates. Did this for raylib-umka...

/**
 * Retrieve all defines across all the raylib modules.
 */
function getAllDefines() {
    let defineNames = []

    let allDefines = [
        ...raylib.raylib.defines,
        ...raylib.raymath.defines
    ]

    allDefines = allDefines.filter(defineDetails => {
        if (defineNames.includes(defineDetails.name)) {
            return false
        }
        defineNames.push(defineDetails.name)
        return true
    })

    return allDefines
}