cleanup: Rename gles2n64 --> gln64 in comments and variables.

Changes to the resources (translations, keys) will be done later.
cleanup: Rename gles2glide64 --> glide64 in comments and variables.

Changes to the resources (translations, keys) will be done later.
cleanup: Rename gles2rice --> rice in comments and variables.

Changes to the resources (translations, keys) will be done later.