renderer: load/unload water textures (similar to alpha maps); do that in delay load and avoid leaking them.

GUIrenderer: add oglSquelchError

lib.h: add feq() (checks for floating point equality); remove redundant
if from SAFE_DELETE
maths: use new feq()
Model*RData, VertexArray: fix trivial warnings

This was SVN commit r2904.

source/renderer/ModelDefRData.cpp

@@ -71,7 +71,7 @@ void CModelDefRData::PrepareStream(uint streamflags)
 		return;
 
 	u8* base = m_Array.Bind();
-	size_t stride = m_Array.GetStride();
+	GLsizei stride = (GLsizei)m_Array.GetStride();
 	
 	glTexCoordPointer(2, GL_FLOAT, stride, base + m_UV.offset);
 }