Make the animation delay during debugging adjustable and add GUI control for this in browsers

[szokolai-mate]

During a txtUML Application execution, there is a built-in delay before every state-change. Currently this delay is constant. We should make this delay variable by a slider on the browser GUI.

Sub-tasks:

• make ANIMATION_TIMER variable in hu.elte.txtuml.diagnostics.animation.AnimationConfig or achieve eqvivalent
• make the above variable readable and adjustable in hu.elte.txtuml.api.model.execution.diagnostics.DiagnosticsServer
• add handler for setting the delay in the above server class
• add a range typed input element to the debug panel in the GUI ( https://github.com/ELTE-Soft/txtUML/blob/4bb0404e6516f51dea8654b0fe3430abf00585fa/dev/plugins/hu.elte.txtuml.export.javascript/src/hu/elte/txtuml/export/javascript/resources/res/visualize.html)
• add javascript handler to communicate the change to input to the DiagnosticsServer (https://github.com/ELTE-Soft/txtUML/blob/4bb0404e6516f51dea8654b0fe3430abf00585fa/dev/plugins/hu.elte.txtuml.export.javascript/src/hu/elte/txtuml/export/javascript/resources/res/pollingRefresh.js)

Relevant code, courtesy of @djnemeth :

• location of ANIMATION_TIMER : https://github.com/ELTE-Soft/txtUML/blob/4bb0404e6516f51dea8654b0fe3430abf00585fa/dev/plugins/hu.elte.txtuml.diagnostics/src/hu/elte/txtuml/diagnostics/animation/AnimationConfig.java#L7
• implementation of the delay : https://github.com/ELTE-Soft/txtUML/blob/4bb0404e6516f51dea8654b0fe3430abf00585fa/dev/plugins/hu.elte.txtuml.diagnostics/src/hu/elte/txtuml/diagnostics/animation/Animator.java#L74

[szokolai-mate]

After a thorough discussion, we decided that hu.elte.txtuml.api.model.execution.diagnostics.DiagnosticsServer shall be moved to hu.elte.txtuml.diagnostics.animation.javascript to bridge the project-gap, as it has no real dependencies of hu.elte.txtuml.api.model.execution, the functionality needed by DiagnosticsServer is also present in hu.elte.txtuml.diagnostics.session.DiagnosticsPlugin and this way we won't introduce new module dependencies.