TEXTURETYPE_UNSIGNED_INT confusion

[CedricGuillemet]

TEXTURETYPE_UNSIGNED_INT is 8bits/component
TEXTURETYPE_UNSIGNED_INTEGER is 32bits/component
TEXTURETYPE_INT is 32bits/component
To avoid confusion, this PR use more explicit TEXTURETYPE_UNSIGNED_BYTE instead of TEXTURETYPE_UNSIGNED_INT and deprecates its definition.

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To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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[sebavan]

thanks a ton @CedricGuillemet