Feature/gaia mission merge (#766)

* Add Adam Aslegård's module that renders Gaia mission stars
 * Add module for Gaia mission
 * Add CCfits and cfitsio submodules and the implemented fitsfilereader module from the OpenSpace-sun-earth-event branch
 * Add a TaskRunner to read from a fits file

data/tasks/gaia/gaia_download.task

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+return {
+    {
+        Type = "SyncAssetTask",
+        Asset = "scene/milkyway/gaia/gaia_dr2_download_stars"
+    }
+}

data/tasks/gaia/gaia_octree.task

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+local dataFolder = "E:/gaia_sync_data"
+return {
+    {
+        Type = "ConstructOctreeTask",
+        InFileOrFolderPath = dataFolder .. "/Gaia_DR2_full_24columns/",
+        OutFileOrFolderPath = dataFolder .. "/DR2_full_Octree_test_50,50/",
+        MaxDist = 500,
+        MaxStarsPerNode = 50000,
+        SingleFileInput = false,
+        -- Specify filter thresholds
+        --FilterPosX = {0.0, 0.0},
+        --FilterPosY = {0.0, 0.0},
+        --FilterPosZ = {0.0, 0.0},
+        FilterGMag = {20.0, 20.0},
+        FilterBpRp = {0.0, 0.0},
+        --FilterVelX = {0.0, 0.0},
+        --FilterVelY = {0.0, 0.0},
+        --FilterVelZ = {0.0, 0.0},
+        --FilterBpMag = {20.0, 20.0},
+        --FilterRpMag = {20.0, 20.0},
+        --FilterBpG = {0.0, 0.0},
+        --FilterGRp = {0.0, 0.0},
+        --FilterRa = {0.0, 0.0},
+        --FilterRaError = {0.0, 0.0},
+        --FilterDec = {0.0, 0.0},
+        --FilterDecError = {0.0, 0.0},
+        FilterParallax = {0.01, 0.0},
+        FilterParallaxError = {0.00001, 0.5},
+        --FilterPmra = {0.0, 0.0},
+        --FilterPmraError = {0.0, 0.0},
+        --FilterPmdec = {0.0, 0.0},
+        --FilterPmdecError = {0.0, 0.0},
+        --FilterRv = {0.0, 0.0},
+        --FilterRvError = {0.0, 0.0},
+    },
+
+    -- {
+    --     Type = "ConstructOctreeTask",
+    --     InFileOrFolderPath = dataFolder .. "/AMNH/Binary/GaiaUMS.bin",
+    --     OutFileOrFolderPath = dataFolder .. "/AMNH/Octree/GaiaUMS_Octree.bin",
+    --     MaxDist = 10,
+    --     MaxStarsPerNode = 20000,
+    --     SingleFileInput = true,
+    -- },
+}

data/tasks/gaia/gaia_read.task

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+local dataFolder = "E:/gaia_sync_data"
+return {
+    {
+        Type = "ReadFitsTask",
+        InFileOrFolderPath = "L:/Gaia_DR2/gaia_source/fits/",
+        OutFileOrFolderPath = dataFolder .. "/Gaia_DR2_full_24columns/",
+        SingleFileProcess = false,
+        ThreadsToUse = 8,
+    },
+
+    --{
+    --    Type = "ReadSpeckTask",
+    --    InFilePath = dataFolder .. "/AMNH/GaiaUMS/GaiaUMS.speck",
+    --    OutFilePath = dataFolder .. "/AMNH/Binary/GaiaUMS.bin",
+    --},
+}