* Implement signature help - closes#1841
* Add explicit signature count
* [LSP] Do analysis for every signatureHelp request
See here: https://github.com/vimeo/psalm/pull/1862#issuecomment-507007346
* Don’t language server information when checking property for init
* Fix signature help for functions
* Add try-catch around signature help Functions::getStorage()
Language Server
---------------
When typing quickly, the LSP client can send multiple messages
in a group, including didChange messages followed by completion
messages. Currently, LanguageServer::doAnalysis() is only called
after a message group is processed. This can result in completion
being done with outdated file contents for example:
Message group with two messages is received
1. `didChange`: file analysis is queued for modified file
2. `completion`: completion attempted on stale file contents
3. `messageGroupRead`: analysis is done, but too late for completion
This commit ensures that any queued file analyses are done prior
to serving completion requests.
* Revert "Revert "Implement better progress""
This reverts commit 4302596654.
* Revert "Revert "Implement dots progress bar""
This reverts commit e41733d789.
* Revert "Revert "Switch to VoidProgress by default""
This reverts commit 304ffeb0a3.
* Revert "Revert "Pass success flag to progress""
This reverts commit 62a690ee4e.
* Improve socket communication
* Use an underscore
* Add means to disable progress
* Add extra newline before progress bar
