nerf dash

[Thyrexx]

Jira-Issue: GER-56

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Currently the dash is pretty powerful right from the start and there is not really a reason to get upgrades for it. So we should nerf it.

• only one dash at the beginning
• more dash cooldown

[Jakllp]

Needs to be reevaluated after the first part of #154 was done in e93cd21

[leolady02]

• only one dash at the beginning! -> extra dashes are not special