Future-proof dynCalls

[0xFirekeeper]

Closes TOOL-3700

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PR-Codex overview

This PR focuses on refactoring the code to replace direct calls to Runtime.dynCall and Module.dynCall with a new makeDynCall function, enhancing the code's maintainability and readability.

Detailed summary

• Replaced Runtime.dynCall with {{{ makeDynCall("v", "vars.callback") }}}() in SystemThreadingTimer.jslib.
• Updated touchend and focusout event listeners in WebGLInputMobile.jslib to use makeDynCall.
• Changed WebSocket callback calls in WebSocket.jslib to makeDynCall.
• Removed checks for Runtime.dynCall in WebGLWindow.jslib and WebGLInput.jslib, simplifying the code.
• Unified the callback invocation method across multiple functions in WebGLInput.jslib.

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[linear]

TOOL-3700 Fix non-future-proof invocations of Emscripten dynCalls