Add basic logging functionality

[JellevanCampen]

Add basic logging functionality that allows for recording log messages to different log channels. It should be possible to output log messages to:

• [x] The console - Shows messages on the Windows terminal. Diferent log channels should be distinguishable through color and (perhaps) a channel tag.
• [x] Files - Outputs logs as human-readable text files. Different channels should be output to different log files.
• [x] Global file - Outputs multiple log channels into a single global text file. This is used for tracing sequences of events.

Each log channel should have the following properties:

• [x] Log name - Full human-readable name of the logging channel.
• [x] Log tag - Abbreviated name used on the console and in filenames.
• [x] Log color - Color to use to display messages in the log channel.
• [x] Timestamping - Whether to automatically prepend timestamps to log messages.

Generating log messages should be:

• [x] fast and easy API-wise - Logging should be possible in one call, without requiring setup calls.

It should be possible to:

• [x] log to multiple channels simultaneously

[JellevanCampen]

Added Global file as an output channel for debugging sequences of events.

[JellevanCampen]

Global file is implemented in 94c3646.

[JellevanCampen]

Files is implemented in 745a268.

[JellevanCampen]

Log color is implemented in 2a4194e.

[JellevanCampen]

Timestamping is implemented in 8d3af43.