Use path in triple-slash directives

[minggangw]

This patch uses path in triple-slash directives, and restores the tsconfig.json removed previously,

Reference:

• https://www.typescriptlang.org/docs/handbook/triple-slash-directives.html

Fix: #1073

[coveralls]

coverage: 85.355%. remained the same
when pulling ff765d5 on minggangw:fix-1073
into da39f55 on RobotWebTools:develop.