sync head master to fork master (#2)

* add -- ability to select only one value

* feature -- Disabled options

* feature -- Show selected categories on Detail

* feature -- experimental support of HasMany and BelongsTo relations

* fix -- support for custom relationships that extends base BelongsTo, BelongsToMany, HasMany relationships

* fix -- the order of searching for relation handlers, at first search in registered handlers, then try to check instance of base relations

* add -- MIT License

* feature -- validation rules

* fix -- readme fix

* fix -- added in readme.md info about license

* fix -- BelongsToHandler support of mute events for old laravel versions

* fix -- pass object class namespace for correct error handling

* perf -- load tree for field by tag once for request

* add -- option withFlatten

* add -- option ->isActiveFalseValue( $value )

* feature -- support of defined resource indexQuery

* fix field detail style

Co-authored-by: phoenix <[email protected]>
Co-authored-by: haoflynet <[email protected]>
Co-authored-by: Roman <[email protected]>

Author: 4 people

LICENSE

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+MIT License
+
+Copyright (c) 2020 Roman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.