Added configuration fiels for the voxel, passthrough, outlier removal and...

Added configuration fiels for the voxel, passthrough, outlier removal and radius outlier removal PCL filters.

config/default_outlier_removal_config.yaml

+mean_k: 20
+stddev: 2.0
+negative: False
+

config/default_passthrough_config.yaml

+filter_field_name: x
+filter_limit_min: 1.1
+filter_limit_max: 2.2
+filter_limit_negative: False

config/default_radius_outlier_removal_config.yaml

+radius_search: 0.1
+min_neighbors: 15
+

config/default_voxels_config.yaml

+leaf_size: 0.03
+filter_field_name: z
+filter_limit_min: -0.5
+filter_limit_max: 3.0
+filter_limit_negative: False