make isOnMainThread really universal, not a context extension

package com.simplemobiletools.commons.helpers

import android.content.Context

import android.os.Build

import android.os.Looper

const val WEEK_DAYS_BIT = MONDAY_BIT or TUESDAY_BIT or WEDNESDAY_BIT or THURSDAY_BIT or FRIDAY_BIT

const val WEEKENDS_BIT = SATURDAY_BIT or SUNDAY_BIT

fun Context.isOnMainThread() = Looper.myLooper() == Looper.getMainLooper()

fun isOnMainThread() = Looper.myLooper() == Looper.getMainLooper()

fun isJellyBean1Plus() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1

fun isAndroidFour() = Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT_WATCH