Adopt LSP4J 0.9

[pisv]

LXTK 0.2.0 will require LSP4J 0.9.0 as the minimum version.

As noted in the CHANGELOG, LSP4J 0.9.0 introduces a number of breaking API changes, some of which will cause breaking changes in LXTK API.

[pisv]

Affected LXTK APIs:

• DefinitionProvider.getDefinition(TextDocumentPositionParams) -> DefinitionProvider.getDefinition(DefinitionParams)
• DefinitionRequest.send(DefinitionProvider, TextDocumentPositionParams) -> DefinitionRequest.send(DefinitionProvider, DefinitionParams)
• DocumentHighlightProvider.getDocumentHighlights(TextDocumentPositionParams) -> DocumentHighlightProvider.getDocumentHighlights(DocumentHighlightParams)
• DocumentHighlightRequest.send(DocumentHighlightProvider, TextDocumentPositionParams) -> DocumentHighlightRequest.send(DocumentHighlightProvider, DocumentHighlightParams)
• HoverProvider.getHover(TextDocumentPositionParams) -> HoverProvider.getHover(HoverParams)
• HoverRequest.send(HoverProvider, TextDocumentPositionParams) -> HoverRequest.send(HoverProvider, HoverParams)
• PrepareRenameRequest.send(RenameProvider, TextDocumentPositionParams) -> PrepareRenameRequest.send(RenameProvider, PrepareRenameParams)
• RenameProvider.prepareRename(TextDocumentPositionParams) -> RenameProvider.prepareRename(PrepareRenameParams)
• SignatureHelpProvider.getSignatureHelp(TextDocumentPositionParams) -> SignatureHelpProvider.getSignatureHelp(SignatureHelpParams)
• SignatureHelpRequest.send(SignatureHelpProvider, TextDocumentPositionParams) -> SignatureHelpRequest.send(SignatureHelpProvider, SignatureHelpParams)