Beats installer MVP

[ghost]

• Release manager integration Release Manager integration #22
• Signing mechanism Implement package signing. #14
• CLI shim, Add CLI shim that reads same configuration files as Windows sevice #10
• Remove functionbeat, functionbeat on Windows #33
• Remove version from path to data directories Remove version from path to data/config directories #39
• Rename configuration file {beatname}.yml to {beatname}.example.yml to prevent upgrade from deleting the former. Remove version from path to data/config directories #39
• Give user further steps to follow after install finished. E.g: URL to getting started, point to .yaml config file, etc. Let user know what to do next after install is complete #40

Optional:

• Talk to InfoSec wrt reuse of existing certificates
• Update Getting Started document to account for new MSI-based workflow.

[philkra]

submit a PR to release manager the day after the stack 7.5.0 release.

[philkra]

post-install action, provide the user a possibility to open the directory of the *beat yaml config and select the file directly.