Revert "internal/graphicsdriver/metal: Bug fix: Vsync didn't work on …

…macOS"

This reverts commit 1dd13ae.

Reason: This caused FPS drop on macOS 12.0.1

Updates hajimehoshi#1885
Closes hajimehoshi#1939

internal/graphicscommand: bug fix: overflow when len(vertices) > len(…

…indices)

Closes hajimehoshi#1913

ebiten: Add VibrationOptions to specify intensity (hajimehoshi#1891)

Updates hajimehoshi#1452

internal/uidriver/glfw: Bug fix: Rendering should be updated after re…

…storing from fullscreen

u.toChangeSize affects the result of u.updateSize. When the callback
for WindowSetSize is invoked, toChangeSize should be true.

In order to simplify the logic, we have to remove toChangeSize later.

Closes hajimehoshi#1884

internal/graphicsdriver/opengl: Avoid allocations by escaping to heap

internal/uidriver/glfw: Bug fix: Crashed a transparent button with th…

…e green button

Updates hajimehoshi#1822
Closes hajimehoshi#1857

internal/glfw: Add a new build tag `ebitenexternaldll` to requrie ext…

…ernal DLLs

Embedding a DLL file and extrating it on the fly can be problematic.
The application might be unexpectedly recognized as a virus by some
virus checkers.

To mitigate this issue, Ebiten adds a new build mode `ebitenexternaldll`
which prevents Ebiten from embedding DLL files. Instead, the application
will require DLL files for GLFW.

Closes hajimehoshi#1832

internal/uidriver/glfw: Wait for a FramebufferSize callback for the i…

…nitial temporary window

Updates hajimehoshi#1847

Update Oto to v2.1.0-alpha.2

Update Oto to v2.1.0-alpha.2