Create blocks to customize screen layout

Added blocks to allow setting position and size of dialogs:

• It is possible to configure text windows and menus separately;
• It is possible to set the x and y coordinates of the dialogs;
• It is possible to set the width and height of the dialogs;
• It is possible to set those informations in characters or in percentage;
• When a negative value is informed to the x coordinate, it is understood as "count the position from the right, instead of the left";
• When a negative value is informed to the y coordinate, it is understood as "count the position from the bottom, instead of the top".

Fix background image height

Background image height was being set to 202 instead of 200.

Fix special characters on image names.

Merge pull request #37 from haroldo-ok/fix-accents-on-image-names
This fixes #28

Clear keyboard buffer before and after the say command.

Clear keyboard buffer before and after the `say` command.

Merge pull request #36 from haroldo-ok/fix-say-keyboard-buffer
This fixes #35

Fix character name bug

Due to a typo on the engine code, the selected character name wasn't being displayed, instead showing a fixed string. This was corrected.

Fix compilation error

The released version 0.2.3 had a bug where it was looking for 8bit-Unity on the wrong directory, preventing the compilation from working at all.

Image selection dropdown height

Corrected a bug where the height of the dropdown would exceed the height of the screen if there where too many images to list.

Fixed a few compilation bugs that happened if the project wasn't named `test`.

• Routine that moved variable declarations to the top of the function caused an error if there were no variables;
• Fixed a pair of compiler invocation errors that happened if the current project wasn't named test.

Version 0.2.1: Correct lynx portrait bug.

Correct bug where portraits failed to display on Lynx.

Support for portraits.

Now, the games can display character portraits.