ConditionVariable.wait with predicator

[samchon]

TSTL had not implemented ConditionVariable class to use predicator in wait functions. At next update, they're need to be implemented.

namespace std
{
    export class ConditionVariable
    {
        public wait(): Promise<void>;
        public async wait(predicator: Predicator): Promise<void>
        {
            while (!await predicator())
                await this.wait();
        }

        public wait_for(ms: number): Promise<boolean>;
        public wait_for(ms: number, predicator: Predicator): Promise<boolean>;

        public wait_until(at: Date): Promise<boolean>;
        public async wait_until(at: Date, predicator: Predicator): Promise<boolean>
        {
            while (!await predicator())
                if (!await this.wait_until(at))
                    return await predicator();
            return true;
        }
    }
}
type Predicator = () => boolean | Promise<boolean>;