Improved soft-scaling, sprite positioning, and UI mockup

The major feature of this release is that it fixes the soft-scaling so that it is (nearly) as fast as running in native resolution. I find this improves the experience greatly! Press f to toggle printing fps to the terminal.

Other than that, this release also fixes a bug in the positioning of the bumbarrel sprite, which was causing the bird to consistently miss the
pointer. The temporary background has also been replaced (again), with a version with kinder contrast, and a mock-up of where UI elements may one day show up.

Reworked controls and documentation

Controls have been reworked so that double-clicking with left mouse button dashes, while pressing and holding will make the bumbarrel fly continuously towards the cursor. The right mouse button still works differently from what the documentation says: Double-clicking the right mouse button now makes the bird perch, while single click just changes direction.

Aside from this, the code has been refactored a bit, some minor issues fixed, screen has been increased to 640x480 from 320x240 (not sure which is better), and release notes have been included in the build.

Fix memory leak

This release only fixes the memory leak (#1) and provides some code clean-up. Refer to release v0.0.1 for further release notes.

Initial early alpha releas (caution! memory leak!)

Initial very early development release of Teulu. Basic movement works, but the right mouse button works differently from what the documentation says for now, prompting immediate perching.

The game appears to have a memory leak that can freeze the computer until the OS kills it (issue #1). It seems fairly benign, but use q or esc to pre-emptively quit before this happens.

Note that the build artefact requires SDL1.2 to be installed in order to run. I'll see if I can get it to build with it bundled in the future.