#1 Change of access for png loader

[Gary Stewart]

Request to change, in IOTextureLoader or PNGTextureLoader:

protected boolean readTexture(InputStream is)

to

public boolean readTexture(InputStream is)

to allow getResourceAsStream methods to directly
interface with this method.

Also adding a:

public boolean readTexture(java.net.URI)

might be worth considering if a move to JRE 1.4.x was
decided upon.

[Peter Ashford]

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Yes PLEEEEEEZE ;-)