Renames interface to codec_interface since it is a reserved
word on windows.

Change-Id: I84f2cbf257a4c44f16dc2464127e35ee405c2c3e

More size_t/unsigned int disagreement.

Change-Id: I2be01ee680f852f168f6fcac554a534ca3c83e5d

Change-Id: I137e5e6585356792913e1e84da6c0a439c5153a5

Right now only IVF format is supported which is enough for example code.
Other formats like y4m, webm, raw yuv will be supported later.

Change-Id: I34c6f20731c1851947587ca5c589d7856b675164

Change-Id: I374a0c4bb4a66c0d3dc874c6e57fdee9d1ab72df

New API is supposed to be used from example code. Current implementation
only supports IVF containers (will be extended to Y4M).

Change-Id: Ib7da87237690b1a28297bdf03bc41c6836a84b7e

This is still work in progress, there are many another planned updates
for all example files.

Change-Id: I2ba5dc6cd19a4bea9fbc6f1ee84cc2bd85925966

Change-Id: Ifee528b1663b10dbe45e0bfef79010370c914e3a

All documentation will be provided as comments in the source files.

Change-Id: Ie609852747733c181191f864204c787a6b23ef3a