Added support for custom windows

[codecov[bot]]

Codecov Report

Patch coverage: 96.07% and project coverage change: +0.50% :tada:

Comparison is base (82f816a) 95.94% compared to head (f2db04c) 96.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #99 +/- ## ========================================== + Coverage 95.94% 96.44% +0.50% ========================================== Files 35 35 Lines 1111 1183 +72 ========================================== + Hits 1066 1141 +75 + Misses 45 42 -3 ``` | [Files Changed](https://app.codecov.io/gh/nateosher/DIMPLE/pull/99?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [R/MltplxExperiment.R](https://app.codecov.io/gh/nateosher/DIMPLE/pull/99?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Ui9NbHRwbHhFeHBlcmltZW50LlI=) | `97.27% <95.23%> (+2.46%)` | :arrow_up: | | [R/MltplxImage.R](https://app.codecov.io/gh/nateosher/DIMPLE/pull/99?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Ui9NbHRwbHhJbWFnZS5S) | `100.00% <100.00%> (ø)` | | | [R/MltplxIntensity.R](https://app.codecov.io/gh/nateosher/DIMPLE/pull/99?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Ui9NbHRwbHhJbnRlbnNpdHkuUg==) | `97.50% <100.00%> (+0.06%)` | :arrow_up: | | [R/MltplxObject.R](https://app.codecov.io/gh/nateosher/DIMPLE/pull/99?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Ui9NbHRwbHhPYmplY3QuUg==) | `97.46% <100.00%> (+0.43%)` | :arrow_up: |

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