The 2019 motile active matter roadmap by Gompper, G, Winkler, RG, Speck, T, Solon, A, Nardini, C, Peruani, F, Loewen, H, Golestanian, R, Kaupp, UB, Alvarez, L, Kioerboe, T, Lauga, E, Poon, W, de Simone, A, Cichos, F, Fischer, A, Landin, SM, Soeker, N, Kapral, R, Gaspard, P, Ripoll, M, Sagues, F, Julia Yeomans, Doostmohammadi, A, Aronson, I, Bechinger, C, Stark, H, Hemelrijk, C, Nedelec, F, Sarkar, T, Aryaksama, T, Lacroix, M, Duclos, G, Yashunsky, V, Silberzan, P, Arroyo, M, Kale, S