Fixed save/load, sfg creating, simulation, bug fixes

Fixed a lot of bug fixes, also added shortcut for creating signal "Space"

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• 6568ebbd - added float as valid input, and fixed some crash with load

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• 4b0087b5 - added list as input to simulation, fixed remove

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• 79c5a170 - 1 commit from branch develop
• 4b6bf3b2 - merge w/ develop

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• 4b6bf3b2...3e1b411d - 2 commits from branch develop
• d64b24da - merged w/ latest develop

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• 46ac7a5a - fixed value setting of delay in properties

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mentioned in commit 8ff6a132

merged