replaced colon with space in log message header

Makes this:

    [ofAppGLFWWindow:verbose] creating GLFW window
    [ofAppRunner:verbose] GL ready
    [ofAppRunner:verbose] Vendor:   NVIDIA Corporation
    [ofAppRunner:verbose] Renderer: NVIDIA GeForce 9400M OpenGL Engine
    [ofAppRunner:verbose] Version:  2.1 NVIDIA-8.12.47 310.40.00.05f01
    [ofAppRunner:verbose] GLSL:     1.20
    [ofFile:error] copyFromTo(): source file/directory doesn't exist: "../../../data/ka1.txt"
    [ofAppGLFWWindow:verbose] key: 343 state: 1
    [ofAppGLFWWindow:verbose] key: 343 state: 0

into this:

    [ofAppGLFWWindow verbose] creating GLFW window
    [ofAppRunner verbose] GL ready
    [ofAppRunner verbose] Vendor:   NVIDIA Corporation
    [ofAppRunner verbose] Renderer: NVIDIA GeForce 9400M OpenGL Engine
    [ofAppRunner verbose] Version:  2.1 NVIDIA-8.12.47 310.40.00.05f01
    [ofAppRunner verbose] GLSL:     1.20
    [ofFile error] copyFromTo(): source file/directory doesn't exist: "../../../data/ka1.txt"
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] mouse button: 0
    [ofAppGLFWWindow verbose] key: 68 state: 1
    [ofAppGLFWWindow verbose] key: 68 state: 0
    [ofAppGLFWWindow verbose] key: 68 state: 1
    [ofAppGLFWWindow verbose] key: 68 state: 0
    [ofAppGLFWWindow verbose] key: 256 state: 1
    [ofEvents verbose] OF app is being terminated!

We agreed on the chat that the second is more readable.