Blockly: remove strict mode
Blockly: remove strict mode

Different browsers seem to have different definitions for strict mode, making
blockly_lib stop working on some browsers. Until we can check and fix all
issues raised by each browser, it's safer to disable it.

France-ioi/bebras-modules,be-oi/beoi-contest-modules,be-oi/beoi-contest-modules,France-ioi/bebras-modules