Added a Range Slider control. A two handled slider that changes a Low and High value, between a Min and Max.

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Replicates the EditorGUI.MinMaxSlider, but is an extension of the Default Slider, including the option to use WholeNumbers. Raises a UnityEvent<float, float> onValueChanged.

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Added Range Slider controller. Squashed commit of previous work. commit 6c5cf2dc036cf385b81fdfc8072300704b06b435 Merge: fb991af bf30261 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 17:54:34 2019 +0000 Merge branch 'refs/heads/master' into range-slider commit bf302616b8ae377a859d2012b856dc370efe40c2 Merge: 10919c6 76d2299 Author: Ben MacKinnon bilmackinnon@googlemail.com Date: Tue Nov 12 17:44:57 2019 +0000 ``` Merge pull request #1 from Dover8/range-slider Range slider ``` commit 76d22998d38801ab35ba19743d944263041924a5 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 17:36:23 2019 +0000 ``` Updated PointerDown to update the target graphic Re-enabling colour tint interaction. ``` commit 2d2ca219d5c0865ba4eaa428e8a167118aa06360 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 16:59:29 2019 +0000 Updated headers to match the standard format of the project commit 9a0d3f4aaddbcee2565693b0733c0001a2de2a90 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 16:43:22 2019 +0000 Some further default value set when creating a RangeSlider commit 748d1484568e16aa0bd2e3949330e48ce7245570 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 16:38:34 2019 +0000 Added the menu creation options for the Range Slider commit fa9e9beceede8c708529cd6a3ea98673b2d6d2c2 Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Tue Nov 12 12:55:38 2019 +0000 ``` Editor layout for the Range Slider Using the EditorGUILayout.MinMaxSlider to control the RangeSlider. It was this control that we are replicating in the UI. ``` commit 32b731548e8e7f286964a4a7a35fd945e5d5a31a Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Mon Nov 11 16:19:16 2019 +0000 Updated namespace and header commit 4d0fa2e7dc535b343cf10def6e01886383cc88ac Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Mon Sep 16 12:41:45 2019 +0100 ``` Added interaction Range slider is now interactable with both handles and the bar ``` commit f4be93752719a08b95594e545eb16b27d3b3bcea Author: Ben MacKinnon ben.mackinnon@soluis.com Date: Fri Sep 13 15:27:15 2019 +0100 copied over the WIP RangeSlider from current project

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